Few things to mention after few days of using it.
AF is louder compare to Nifty-Fifty. Focus ring rotates freely if AF is enabled, which is nice. Fast to focus, because inner tube travels only few mm to focus between infinity and 1.5 meter. To focus closer it has to move much more.
My copy missing focus in bad light sometimes. More compare to Nifty-Fifty. Adding of flashlight helps in the dark.
But in extreme bright backlight it is front focusing some times.
I was focusing at cat's head on this photo:
Going to test it on 5D.